export default {
	namespaced: true,
	state: () => ({
		//购物车的数组，用来存储购物车中每个商品的信息对象
		//每个商品的信息对象，都包含如下 6 个属性
		cart: JSON.parse(uni.getStorageSync('cart') || '[]')
	}),

	mutations: {
		addToCart(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)

			console.log(findResult)
			if (!findResult) {
				state.cart.push(goods)
			} else {
				findResult.goods_count++;
			}
			this.commit('m_cart/saveToStorage')
		},
		saveToStorage(state) {
			uni.setStorageSync('cart', JSON.stringify(state.cart))
		},
		//更新购物车中商品的勾选状态
		undateGoodsState(state, goods) {
			const findResult = state.cart.find(x => x.goods_id === goods.goods_id)
			if (findResult) {
				findResult.goods_state = goods.goods_state;
				this.commit('m_cart/saveToStorage')
			}
		},
		//更新商品的数量
		updateGoodsNumber(state, goods) {
			const findResult = state.cart.find((x) => x.goods_id === goods.goods_id)
			if (findResult) {
				findResult.goods_count = goods.goods_count
				this.commit('m_cart/saveToStorage')
			}
		},
		//根据商品的 id 删除对应的商品
		removeGoodsById(state, goods_id) {
			state.cart = state.cart.filter(x => x.goods_id !== goods_id)
			this.commit('m_cart/saveToStorage')
		},
		//更新购物车所有商品的勾选状态

		undateAllGoodsState(state, newState) {
			state.cart.forEach(x => x.goods_state = newState)
			this.commit('m_cart/saveToStorage')
		}
	},
	getters: {
		// 统计购物车中商品的总数量

		total(state) {
			// let c = 0;
			// state.cart.forEach(x => c += x.goods_count)
			// return c;

			return state.cart.reduce((total, item) => total += item.goods_count, 0)
		},
		//选中商品的数量
		checkedCount(state) {
			return state.cart.filter(x => x.goods_state).reduce(
				function(total, item) {
					return total += item.goods_count
				}, 0)
		},
		//选中商品的总价格
		checkedGoodsAmount(state){
		return	state.cart.filter(x=>x.goods_state).reduce(function(total,item){
				return total+=item.goods_count*item.goods_price
			},0).toFixed(2)
		}

	}
}
